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Mercedes
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Discussion Starter #1
On my 190, recently I am experiencing a problem that I can't seem to figure out. While braking or slowing down, I often hit the clutch and put the transmission in neutral, however, the RPM's go so low that the car stalls(all the idiot lights turn on). When the car is still in motion, with the engine off, I can put the car into 2nd gear... RELEASE the clutch and bam... the car is back on again. While driving or acceleratingly, the car behaves normally. Its only while braking that I experience this annoying symptom. The car can stall in both ways, one with the car slowing down in neutral... the other, with the car slowing down with the clutch depressed all the way down. In both cases, if the car has not slowed down fully, I can put the car in 1 or 2nd gear and let go of the clutch to have it start up again.

Any ideas on where I should look into?

thanks inadvance
 

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Mercedes
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Discussion Starter #3
is the A/C on? i used to experience the same thing in my sportline, so i just stopped using it lol
No AC on my 190 from factory. Besides, its not normal behavior even with AC to do... so what is the cause? Saying not to use AC (even if I had it) is not a cure to the problem. Anyone else have ideas?

thanks!
 

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1985 w201 Euro 2.3-16vlv / 1992 w201 2.6 Sportline Manual
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well first an foremost I am sure you know that any manual car can be started by dropping the clutch into gear while the car is in motion a dead starter on my old ford had me doing this constantly.

if u were to start the car normally and rev it up while stopped holding the brake will the car stall. does it stall on hard breaks only or also when u tap the brakes slowly as well?
 

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Mercedes
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Discussion Starter #5
if u were to start the car normally and rev it up while stopped holding the brake will the car stall. does it stall on hard breaks only or also when u tap the brakes slowly as well?
Here's a strange observation... when I do as you wrote, the RPM's go up to say about 2500 ansd then let go, it will drop very low to just over 0 and act as if it were to stall but goes back to normal idle RPM (around 650 or so).

Current exhaust set up is headers to CAT to rear Remus box... if it helps determining the problem.
 

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'92 200E M102
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107 Posts
Is your car LPG converted?
If so, you have to turn the air inlet pipe towards the inside of the engine compartment.
 

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Mercedes
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Discussion Starter #9
Is your car LPG converted?
If so, you have to turn the air inlet pipe towards the inside of the engine compartment.
Hello,
yes its converted and the air inlet pipe was long taken out.
 

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1988 190E 2.3
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234 Posts
guys what about a sticky ICV that needs to be cleaned. It may idle normal sometimes but when you go from 2500 to 3000 rpms to nuetral the ICV maybe sticky causing it to respond slowly thus giving you your stall.

I guess my question would be with the car just idling and then you rev it up to say 2500 and let off does it have the same symtoms without the braking being involved.

If not then it maybe the vaccum dropping low on the engine when the brake is applied which could mean a vac leak in the booster as previously stated.
 

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2005 G 55 AMG Grand Edition 342
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29 Posts
I went through this same exact issue. Here are things I did and it has gone away:
1. remove fuel pump relay, use 220 grit sandpaper and sand contacts. 2 passes should do it.
2. Remove OVP and check the fuse(s) on the top. Sand contacts as well
3. Take off pipe to idle control valve and spray in some wd-40. Check connector on bottom.
4. Replace Distributor cap and rotor. Replace spark plugs.

If your issue still happens, you may start with replacing the OVP. The main items that could be causing this are OVP, fuel pump relay, engine temp sensor, idle control valve. I found it was just the contacts on my fuel pump relay were dirty.

Good Luck! Let us know what happens.
 

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1985 500SEC
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I had the EXACT same problem about a week ago, i brought it to my mechaninc, he did a smoke test and realised some of the vacuum lines were cracked from old age, he changed them now the car works perfect
 

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Mercedes
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Discussion Starter #14
I had the EXACT same problem about a week ago, i brought it to my mechaninc, he did a smoke test and realised some of the vacuum lines were cracked from old age, he changed them now the car works perfect
Yep, it was that in mine, too. The hoses under the air filter assembly were ruined and needed replacement. Once done... it now doesn't stall. Best part now, it starts right up!
 
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